Carburetor



Oct. 13,1925- L. M. WOOLSON CARBURETOR Filed June 26, 1920 w M w aPatented Oct. 13, 1925.

UNITED STATES 1,556,664 PATENT OFFICE.

LIONEL M. WOOLSON, OF DETROIT, MICHIGAN, ASSIGNOR T0 PACKARD MOTOR CARCOMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

oannnan'ron Application filed June 26, 1920, Serial No. 881,954.

To all whom it may concern."

Be it known that I, LIONEL M. WooLsoN, a citizen of'the UnitedStates,'and resident of Detroit, Wayne County, State of Michigan, haveinvented certain new and useful Improvements in Carburetors, of whichthe following is a specification.

This invention relates to hydrocarbon motors, and particularly tocarbureting means therefor.

One of the objects of the present invention is to provide a carburetorwith automatic means for increasing and decreasing the flow of airthrough the air passage so that the correct proportion of airandgasoline may be obtained at all speeds.

In general, the invention comprises an air passage and a fuel nozzlewith a valve sliding in the air passage to vary its effective area.

Other objects and advantages of the in vention will appear from thefollowing description taken in connection with the drawings which form apart of this specification, and in which Figure v1 is a verticalsectional view of a carburetor, and the adjacent part of a motor, builtin accordance with this invention;

Figure 2 is a detail view showing another form of certain of the arts;and

Figure 3 is a plan view of Figure 2.

Referring to the drawings, 10 represents a cylinder block, which maycomprise one or more cylinders, and 11 is the motor intake conduitconnected to the cylinder block as by bolts 12. A throttle valve 13 isarranged in this conduit and may be opened and closed by any suitableconnections.

Secured to the intake conduit.11, as by bolts 14, is a carburetor 15,the principal elements of which are a float chamber 16, of well knownform, a main air intake 17, an auxiliary air intake 18, and a mixingchamber 19 with which the air intakes 17 and 18 communicate. As shown,the main air in.- take or passage 17 is controlled by a choke valve 20,and the auxiliary air intake or passa e 18 is controlled by a springclosed valve 21, and both of these valves may be adjusted by theoperator through a rod 22 and the connections shown.

A mixing tube 23, with its interior in the form of a Venturi passage,communicates directly into the mixing chamber 19.

through the tube 23 and is provided with upper and lower outlets, theupper outlet 27 being approximately at the level of the upper end of thetube 23 and discharging lower outlet or port 28 is arrangedapproximately at the throat 29 of the tube 23. This lower outlet 28 isalso slightly above the level maintained by the float chamber so thatthere will be no. leakage from the fuel nozzle when the motor is notrunning.

Arranged to slide within the upper part of the tube 23 is a valve 30which is show-n in the form of a ball sliding directly on the upper partof the fuel nozzle 25 and between the outlets 27 and 28 thereof. Theball is retained on the fuel nozzle by spinning the upper end of thelatter outwardly, as shown at 31, after the ball has been placed on theupper end of the nozzle. A shoulder 32 on the nozzle just above theoutlet 28 determines the lower position of the ball valve 30. When thevalve 30 is in its lowest position as when the motor is throttled andrunning idle, as shown in full lines in Fig. 1, the passage throu h thetube 23 is very nearly closed, there eing only a slight annular spacebetween the valve and the'upwardly flared interior wall of the passage.In this throttled condition of the motor there is very little depressionin the mixing chamber 19 though there is a high depression on the otherside of the throttle 13 in the intake conduit. Under these conditionsthere is only a small fiow of gasoline from the noz-' zle 25.

As the throttle valve 13 is opened there is a greater flow through themixing chamber 19 and the greater suction will raise the valve 30 fromits lower position and at the same time the auxiliary air valve 21 willbe opened to supply additional air. As the maximum open position of thethrottle valve is approached, the valve 30 will be raised The to thedotted line position shown in Fig. 1 and the opening through the tube 23is then much larger and the suction is also much greater both above andbelow the valve 80 so that fuel is drawn through both of the openings 27and 28 of the fuel nozzle.

With the above operation of the valve 30, in cooperation with theauxiliary air valve 21, which may be manually adjusted, an approximatelycorrect mixture is obtained 'at various speeds of the motor.

shown in dotted lines in Figure 2, so that the passage through the tubemay be still further enlarged at high suction.

A specific embodiment of the invention has been described in detail andwill be specifically claimed, but it will be understood that theinvention is not limited to the exact details of construction shown, asit will be apparent that changes may be made without departing from thespirit or scope of the invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is: l

1. In a carburetor, the combination with means forming an air passageand a fuel nozzle extending into the air passage and having upper andlower outlets, of a valve movable on the nozzle between said outlets.

2. In a carburetor, the combination with a fuel nozzle having upper andlower outlets and an air tube surrounding said nozzle, of

sliding on the nozzle between said outlets.

4. In a carburetor, the combination with a mixing tube and a fuel nozzlehaving upper and lower outlets with the upper outlet approximately atthe level of the upper end of the mixing tube, of a valve slidingbetween said outlets.

In a carburetor, the combination with an upwardly flared mixing tube,and a fuel nozzle extending into the tube and having upper and lower.outlets, of a sliding valve operating between said outlets.

6. In a carburetor, the combination with a Venturi mixing tube and afuel nozzle having upper and lower outlets, the lower outlet beingapproximately at the throat of said tube, of a valve sliding betweensaid outlets.

7. In a carburetor, the combination with a Venturi mixing tube and afuel nozzle extending into the tube and having an upper outletapproximately at the level of the upper end of the tube and a loweroutlet approximately at the level of the throat of the'tube, of a valvesliding between said mitlets.

In testimony whereof I aflix my signature.

LIONEL M. WOOLSONL

